MAX6956 Maxim, MAX6956 Datasheet - Page 22

• Manufacturer Part Number: MAX6956
• Description: 2-Wire-Interfaced / 2.5V to 5.5V / 20-Port or 28-Port LED Display Driver and I/O Expander
• Manufacturer: Maxim

2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port LED Display Driver and I/O Expander
22
______________________________________________________________________________________
CLOCK
DATA
SW1
IRQ OUT
SW2
1
47nF
47nF
SW3
2
2
3V
3V
39kΩ
39kΩ
36
35
33
34
31
29
27
25
24
23
22
21
36
35
33
34
31
29
27
25
24
23
22
21
3
2
1
4
3
2
1
4
V+
GND
GND
ISET
AD1
AD0
SDA
SCL
P31
P30
P29
P28
P27
P26
P25
P24
V+
GND
GND
ISET
AD1
AD0
SDA
SCL
P31
P30
P29
P28
P27
P26
P25
P24
MAX6956AAX
MAX6956AAX
U1
U2
P10
P11
P12
P13
P14
P15
P16
P17
P18
P19
P20
P21
P22
P23
P10
P11
P12
P13
P14
P15
P16
P17
P18
P19
P20
P21
P22
P23
P4
P5
P6
P7
P8
P9
P4
P5
P6
P7
P8
P9
16
32
30
28
26
5
7
9
11
6
8
10
12
13
14
15
16
17
18
19
20
32
30
28
26
5
7
9
11
6
8
10
12
13
14
15
17
18
19
20
3V
Typical Operating Circuit
a1
a2
b
c
d1
d2
e
f
g1
g2
h
i
j
k
l
m
dp
ca
a1
a2
b
c
d1
d2
e
f
g1
g2
h
i
j
k
l
m
dp
ca
a1
a2
b
c
d1
d2
e
f
g1
g2
h
i
j
k
l
m
dp
ca
LED1
LED2
LED3